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Heart Valves

Heart Valves

The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...

Cardiac Catheterization II: Right Heart Catheterization

Cardiac Catheterization II: Right Heart Catheterization

Right Heart Catheterization: An OverviewRight heart catheterization is an invasive diagnostic procedure that measures right-sided cardiac and pulmonary artery pressures, calculates cardiac output, and identifies intracardiac shunts. It provides detailed hemodynamic data essential for diagnosing and managing various cardiovascular conditions, such as pulmonary hypertension.Access SitesCommon access sites for right heart catheterization include the internal jugular vein in the neck region, the...

Cardiac Catheterization III: Left Heart Catheterization

Cardiac Catheterization III: Left Heart Catheterization

Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...

Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...

Assessment of the Cardiovascular System IV: Auscultation

Assessment of the Cardiovascular System IV: Auscultation

Cardiac auscultation is a clinical skill used to assess heart function and detect abnormalities. It involves listening to heart sounds at specific anatomical locations through a stethoscope.
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.

Mitral Stenosis I: Introduction

Mitral Stenosis I: Introduction

Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...

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Related Experiment Video

Updated: Jun 19, 2026

An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices

An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices

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A CARDIOVALVULOTOME.

C S Beck¹, E C Cutler

¹Laboratory of Surgical Research of Harvard Medical School, Boston.

The Journal of Experimental Medicine

|October 30, 2009

Summary

This summary is machine-generated.

Developing a new surgical instrument, the cardiovalvulotome, offers a potential solution for treating chronic stenosing rheumatic disease affecting the mitral valve. This device excises diseased tissue, showing promise in preliminary tests.

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Area of Science:

Cardiovascular Surgery
Rheumatic Heart Disease
Surgical Instrumentation

Background:

Chronic stenosing rheumatic disease causes mitral orifice fibrosis and calcification.
Surgical intervention for this condition requires specialized, powerful instruments.
Current treatments may be limited by the available surgical tools.

Purpose of the Study:

To describe a novel surgical instrument for treating mitral stenosis.
To evaluate the efficacy and feasibility of this new instrument.

Main Methods:

Development of a cardiovalvulotome designed to excise mitral valve tissue.
Testing the instrument on stenotic valves from autopsy hearts.
Assessing feasibility through animal surgeries and a human case.

Main Results:

The cardiovalvulotome successfully excises segments from the mitral orifice.
Instrument efficacy demonstrated on diseased heart valves.
Feasibility confirmed in animal models and a human patient.

Conclusions:

The developed cardiovalvulotome is a promising instrument for surgical relief of mitral stenosis.
Further application in treating chronic stenosing rheumatic disease is warranted.
This innovation could advance surgical options for valvular heart conditions.